Final answer:
The painting 'Boulevard des Capucines, 1873' by Claude Monet depicts Paris urbanism and the modernity of the city as shaped by Baron Haussmann's renovations, reflecting the Impressionist movement's focus on contemporary life.
Step-by-step explanation:
The subject of Claude Monet's painting 'Boulevard des Capucines, 1873' is not directly specified, but based on the historical context and Monet's tendencies, we can infer that it aligns with Paris urbanism and the depiction of modernity. Monet was a key figure in the Impressionist movement, which sought to capture the modern experience, characterized by fleeting moments, rapidly changing light, and the hustle of contemporary urban life. Occupied with demonstrating these aspects, Monet's work often reflects on the transformation of Paris during the time, especially after Baron Haussmann's renovation which created wide boulevards and modernized the city, making it a spectacle of modern life and a subject dear to Impressionist painters.